Analysis Of The Influence Of The Wear Of The Microstructure Unfolding Wheel On Its Unfolding Performance And Life Prediction

The unfolding wheel that unfold the entire surface of the steel ball is an important part in the steel ball defect detection machine.Relying on the friction caused by the contact between the asymmetric double cone surfaces on both sides of the unfolding wheel and the steel ball,a moment of lateral rotation is formed on the steel ball,so that the surface of the steel ball to be tested can be fully unfolded in front of the fixed inspection lens.Since the unfolding wheel continuously detects the steel ball and continuously generates friction with the steel ball,the driving surface of the unfolding wheel will wear out,resulting in the original axis inclination angle gradually becoming smaller,Both the unfolding effect and unfolding efficiency will change.If the central axis coincides with the axis of rotation,the unfolding wheel becomes a symmetrical double-cone surface,and the purpose of unfolding the steel ball will not be achieved.To this end,the use of microstructures on the surface of the unfolding wheel to reduce wear and tear,the following studies were conducted.First,study the influence of wear on the unfolding performance of the unfolding wheel,mainly including the stability of the steel ball,the angular velocity of the steel ball during movement,and the efficiency of the unfolding steel ball.The general law of efficiency,through experiments,comparative analysis of the wear resistance of the microstructure surface is superior to the smooth surface.Applying this microstructure to the unfolding wheel has a certain effect on extending the life of the unfolding wheel.Then,a static simulation analysis is carried out on the driving surface of the unfolding microstructured unfolding wheel to verify the difference in the stress on the cone surfaces on both sides of the unfolding wheel.Next,the finite element simulation of the wear of the unfolding wheel drive surface of the microstructure is carried out,and the secondary wear simulation of any contact point is carried out.Based on the relationship between the obtained depth data of the finite element wear simulation and the cumulative number of wear,use MATLAB software to fit this group of data.Prepare for unfolding wheel life prediction.The ADAMS software was used to perform kinematics simulation analysis on the unfolding wheel,and the simulation was carried out under different working conditions to obtain the most ideal working conditions that can make the unfolding wheel unfold.The unfolding performance of unfolding wheels with different degrees of wear was simulated and analyzed to obtain the inclination angle of the partial cone when the unfolding motion of the unfolding wheel failed,and the unfolding performance change before unfolding wheel failure was verified through experiments.Finally,the maximum depth value of the unfolding wheel wear when the unfolding performance of the unfolding wheel fails is calculated and compared with the failure condition of the unfolding efficiency of the unfolding wheel.The maximum depth value of the wear of the unfolding wheel when the unfolding efficiency of the unfolding wheel fails is calculated.The failure condition of wear development,and the calculation formula of wear depth is deduced according to the classic Archard wear life model and adhesive wear theory,and the wear life prediction model of the unfolding wheel is established.A wear prediction example is made according to the actual working conditions,and the life prediction of the unfolding wheel is made according to this example.This article studies the unfolding performance of the microstructure unfolding wheel,the failure conditions of the unfolding wheel wear are obtained,and the wear life of the unfolding wheel on the microstructure surface is predicted,which provides theoretical support for the quality assurance of the surface defect detection of the steel ball.